Fix todo action not grabbing title from first line.

[nerrad]

For examples, see this pull.

The todo action is pulling titles from the body of the todo rather than the title.

[nerrad]

From testing in the linked pull, it looks like this may be due to detection around sentence stops.

[mikejolley]

Coming across this in the PR woocommerce/woocommerce-blocks#4268

The title should be the first line, but it's using the longer description. A possible side effect of this is that the duplicate checking code (https://github.com/woocommerce/automations/blob/trunk/lib/automations/todos/utils/check-for-duplicate-issue.js#L20) fails and recreates the same todo on push.